Suction cleaner filter bags



1958 D. CROPLEY 2,818,936

SUCTION CLEANER FILTER BAGS Filed Feb. 21, 1955 2 SheetsSheet l Jan. 7,1958 w. n. CROPLEY 2,818,936

SUCTION CLEANER FILTER BAGS Filed Feb. 21, 1955 2 Sheets-Sheet 2 d u .I

United ates SUCTION CLEANER FILTER BAGS Application February 21, 1955,Serial No. 439,476

1 Claim. (Q1. 183--51) The present invention relates to dirt filteringbags adapted for use in suction cleaners.

An object of the invention is to provide a filter bag with a memberhaving an opening which constricts the bag inlet to form a flared endfor attaching the bag to the member. A further object is to provide afilter bag having the wall of its inlet projecting through an opening ina member for attachment thereto, and the member forming a mountingadapted to support the bag in a cleaner. Another object is to provide afilter bag having a pair of members one of which has an opening toreceive the wall of the bag inlet and the other member having a portadapted to connect the bag inlet with a suction cleaner conduit. Otherobjects and advantages of the invention will become apparent from thefollowing description and drawings wherein,

Figure l is a side view of a filter bag when deflated,

Figure 2 is a front view of the bag,

Figure 3 is a view of the inner member which receives the bag inlet, and

Figure 4 is a broken view, partly in section, showing the bag arrangedin a tank type cleaner.

The embodiment of the invention herein disclosed com prises a bag havinga body 11 formed of suitable dirt filtering material such as paper, andhas a closed pinched end 12 from which extends top and bottom walls 13and 14 respectively, separated by wedge shaped side walls 15--15 eachhaving a plurality of pleats 16 which are eX- tended when the bag isinflated.

The end of the body -11 is provided with a rectangular opening 17terminating in a flared or flanged end 18 arranged between two endmembers 19 and 20 of relatively stitt paper, and the flange 18 extendslaterally to the extent indicated by the dotted line 21 in Figure 2. Theouter member 20 has an inlet 22 for connection with a suction cleanerconduit. The inner member 19 is provided with a substantiallyrectangular opening 23 lined by the wall of the bag opening 17, and thelatter is centrally aligned with the inlet 22 and extends laterallytherefrom as shown in Figure 2.

In assembling the bag body to the end members 19 and 20 a suitableadhesive is applied to the inner surface of the outer member 20 tosecure the marginal edge of the bag flange 18 thereto. The large opening23 in the inner member 19 is of such size relative to the crosssectional area of the bag when deflated that the member 19 is telescopedover the body portion 11 from the closed end 12 to the flared end 18. Asuitable adhesive is also applied to the inner surface of the innermember 19 for attachatent ment to the bag flange 18 and also the outermember 20. If desired a pressure or heat sensitive adhesive may beapplied to the inner surfaces of the members 19 and 20 and pressure orheat applied to the outer surfaces of the two members to cement themtogether and secure the bag flange 18 therebetween.

The relatively large opening 23 in the inner member 19 provides a simplemethod of assembling the bag to the end members by moving the member 19from the closed end 12 of the bag to the flared end 18. The largeopening 23 also constricts the bag body 11 to determine the lateral areaof the flange 18 and thus forms the size of the bag opening 17.

The bag 10 may be used in a suction cleaner of the type shown in Figure4, comprising a cleaner casing 25 having a motor-fan unit 26 and a latch27 for a pivoted end cap 28 closing the casing opening 29 defined by anannular flange 30. The inner member 19 of the bag is unattached to thebag body 11 laterally from its outer edge to the bag inlet 17 to providea mounting area therebetween which is free of the bag, and as shown inFigure 4 the area adjacent the outer edge of the inner member 19 restson the casing flange 30 to support the bag 10 in the cleaner. If desiredthe inner member 19 can extend inwardly of the peripheral edge of theouter member 20, whereby the latter may rest upon the casing flange 30to support the bag. A11 inlet conduit 32 in the end cap 28 has aresilient gasket 33 which forms an airtight seal against the outermember 20 about the opening 22, and the end of the conduit 32 passesthrough the openings 22 and 17 into the bag 10 to deliver a dirt ladenair stream thereto from the surface being cleaned.

While I have shown and described but one embodiment of my invention, itis to be understood that this embodi ment is to be taken as illustrativeonly and not in a limit ing sense. I do not wish to be limited to theparticular structure shown and described but to include all equivalentvariations except as limited by the scope of the claim.

I claim:

A filter bag adapted to be connected with a conduit conducting dirtladen air in a suction cleaner, comprising a bag body provided with aportion defining an entrance to the bag, a first member arranged in oneplane and having an opening through which the bag marginal end projects,said opening being of less cross section than said body to flare saidprojecting marginal end along a surface of said member surrounding saidopening, and a second plane member attached to said first member tosecure said projecting flared end therebetween whereby said members arean integral part of the bag, said second member having an inlet of lesssize than said opening and communicating therewith and adapted to beconnected with the cleaner conduit, one of said members having amarginal edge free of said body to provide a mounting flange adapted tobe seated in the cleaner to support the bag therein.

References Cited in the file of this patent UNITED STATES PATENTS1,924,249 Marshall Aug. 29, 1933 2,539,195 Lang Jan. 23, 1951 2,596,806Borkoski May 13, 1952

